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    Subject[PATCH 03/24] xen/arm: page.h definitions
    Date
    ARM Xen guests always use paging in hardware, like PV on HVM guests in
    the X86 world.

    Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
    ---
    arch/arm/include/asm/xen/page.h | 77 +++++++++++++++++++++++++++++++++++++++
    1 files changed, 77 insertions(+), 0 deletions(-)
    create mode 100644 arch/arm/include/asm/xen/page.h

    diff --git a/arch/arm/include/asm/xen/page.h b/arch/arm/include/asm/xen/page.h
    new file mode 100644
    index 0000000..6cfe9a1
    --- /dev/null
    +++ b/arch/arm/include/asm/xen/page.h
    @@ -0,0 +1,77 @@
    +#ifndef _ASM_ARM_XEN_PAGE_H
    +#define _ASM_ARM_XEN_PAGE_H
    +
    +#include <asm/page.h>
    +#include <linux/pfn.h>
    +#include <linux/types.h>
    +#include <asm/pgtable.h>
    +#include <xen/interface/grant_table.h>
    +
    +#define pfn_to_mfn(pfn) (pfn)
    +#define phys_to_machine_mapping_valid (1)
    +#define mfn_to_pfn(mfn) (mfn)
    +#define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT))
    +
    +#define pte_mfn pte_pfn
    +#define mfn_pte pfn_pte
    +
    +/* Xen machine address */
    +typedef struct xmaddr {
    + phys_addr_t maddr;
    +} xmaddr_t;
    +
    +/* Xen pseudo-physical address */
    +typedef struct xpaddr {
    + phys_addr_t paddr;
    +} xpaddr_t;
    +
    +#define XMADDR(x) ((xmaddr_t) { .maddr = (x) })
    +#define XPADDR(x) ((xpaddr_t) { .paddr = (x) })
    +
    +static inline xmaddr_t phys_to_machine(xpaddr_t phys)
    +{
    + unsigned offset = phys.paddr & ~PAGE_MASK;
    + return XMADDR(PFN_PHYS(pfn_to_mfn(PFN_DOWN(phys.paddr))) | offset);
    +}
    +
    +static inline xpaddr_t machine_to_phys(xmaddr_t machine)
    +{
    + unsigned offset = machine.maddr & ~PAGE_MASK;
    + return XPADDR(PFN_PHYS(mfn_to_pfn(PFN_DOWN(machine.maddr))) | offset);
    +}
    +/* VIRT <-> MACHINE conversion */
    +#define virt_to_machine(v) (phys_to_machine(XPADDR(__pa(v))))
    +#define virt_to_pfn(v) (PFN_DOWN(__pa(v)))
    +#define virt_to_mfn(v) (pfn_to_mfn(virt_to_pfn(v)))
    +#define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT))
    +
    +static inline xmaddr_t arbitrary_virt_to_machine(void *vaddr)
    +{
    + /* XXX: assuming it is mapped in the kernel 1:1 */
    + return virt_to_machine(vaddr);
    +}
    +
    +/* XXX: this shouldn't be here */
    +static inline pte_t *lookup_address(unsigned long address, unsigned int *level)
    +{
    + BUG();
    + return NULL;
    +}
    +
    +static inline int m2p_add_override(unsigned long mfn, struct page *page,
    + struct gnttab_map_grant_ref *kmap_op)
    +{
    + return 0;
    +}
    +
    +static inline int m2p_remove_override(struct page *page, bool clear_pte)
    +{
    + return 0;
    +}
    +
    +static inline bool set_phys_to_machine(unsigned long pfn, unsigned long mfn)
    +{
    + BUG();
    + return false;
    +}
    +#endif /* _ASM_ARM_XEN_PAGE_H */
    --
    1.7.2.5


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